다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.

Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry

We review the recent developments in the area of optical fiber grating sensors, including quasi-distributed strain sensing using Bragg gratings, systems based on chirped gratings, intragrating sensing concepts, long period-based grating sensors, fiber grating laser-based systems, and interferometric sensor systems based on grating reflectors.

Fiber grating sensors

The PASCAL Visual Object Classes Challenge

Electronic Speckle Pattern Interferometry (ESPI) is a full-field technique based on interferometry that has found applications in a wide range of domains mostly related in the field of non-destructive testing. The continuous progress of electronics, image analysis and processing has allowed during the last years this technique to expand its application horizons. In this contribution we review the use of ESPI as optical metrology tool for new industrial applications, biomaterials and non-destructive evaluation technique for novel materials. For the first topic different examples found in literature have been shown and discussed. In fact, ESPI has been successfully employed for assessing the integrity of stainless steel kegs or for measuring the deformation of the surface of a heated mirror, and also for evaluating residual stress fields in pipes. Further interesting studies were about thermomechanical behavior of a Printed Wired Board. Biomedical field can benefit of ESPI technology since ESPI has been employed for measuring surface displacements during inflation testing of ocular tissues or to assessing strain in bone-implant interfaces. Finally, one more example of application regarding non-destructive testing technique describes some interesting results for characterizing novel “green” and thus sustainable composite materials.

New applications of electronic speckle pattern interferometry in novel materials and structures

https://onlinelibrary.wiley.com/doi/pdf/10.1002/admi.202101164

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro-Photovoltaic Fe-Doped LiNbO3 Platforms

We demonstrate that particles floating in the microfluidic environment can be driven by optical forces along preferential directions. Meanwhile the particles can be imaged by a digital holographic microscope with the aim to get their quantitative phase-contrast signature.

Holographic microscope for quantitative phase-contrast imaging of particles driven by optical forces in microfluidics

Method of interrogation of a static and/or dynamic strain sensor making use of a laser-frequency locking method, and relevant apparatus

Electronic Speckle Pattern Interferometry (ESPI), a non-contact and non-destructive optical techniques, was employed for assessing the conservation state of a XVI Century painting on wood (72x88x1,9 cm). By a long term analysis, the whole structure alterations, induced by the room temperature and relative humidity variations, were evaluated. Measurement of the whole painting structural bends was achieved. Local flaws and hidden detachments of pictorial layers from the support, which cannot be recognized by traditional art-restorer methods, were also revealed. This work was prevalently aimed at achieving a simple approach, in the laboratory practice, to get an intuitively user-friendly method for art conservators, not accustomed to high-tech or math based methods. The results demonstrate that ESPI can largely improve the traditional art conservation survey techniques.

Pietro Ferraro

Papers

New applications of electronic speckle pattern interferometry in novel materials and structures

Droplet Ejection and Liquid Jetting by Visible Laser Irradiation in Pyro-Photovoltaic Fe-Doped LiNbO3 Platforms

Holographic microscope for quantitative phase-contrast imaging of particles driven by optical forces in microfluidics

Method of interrogation of a static and/or dynamic strain sensor making use of a laser-frequency locking method, and relevant apparatus

Non-destructive testing of an original XVI century painting on wood by ESPI system